Graco XM Series Repair Parts page 27

Problem
Display not lit on system with wall
power supply. No green light present
on back of display module (204).
Display not lit on system with wall
power supply. Green light is present
on back of display module (204).
Pumps do not run when Run Mode is
selected and the blue LED is
illuminated.
Pump Test completes without error,
but A or B component has more than
750cc of fluid in beaker.
Batch Test completes without error,
but A or B component has more fluid
in beaker than displayed on screen.
Sprayer does not start when start
button is pressed.
Fluid valves leaking.
313289W
Cause
No electric power. Disconnect "off" or
breaker "open."
No green lights present on display,
FCM, or USB module.
No display power through CAN cable
(266). Green light in present on FCM
(218), but is not present on USB
module (219).
Green light is present on USB module
(219).
Display module failed.
Air pressure to pumps too low.
Air pilot lines are obstructed.
Solenoid valve stuck.
Air pilot valve(s) to motor stuck.
Metering valve(s) not opening.
Air motor stalled.
Incorrect pumps were selected in
System Setup screens.
Air is trapped in fluid due to excessive
agitation, circulation, and heat. Fluid is
measured by volume when it is
compressed under pressure.
See causes for previous pump test
problem.
Faulty start switch or wire harness.
Faulty stop switch or wiring harness.
Loose or worn packings.
Solution
Reset main disconnect and breaker.
Check for 24 Vdc on J1, pins 2 and 3, of power
supply. See Detailed Electrical Schematic,
XM Sprayer with Wall Power (page 1), starting
on page 51. If there is not 24 Vdc, replace with
15V747.
Check CAN cable. Replace if necessary. See
Wall Power Supply Assembly, page 85.
Check CAN cable (274). Replace if necessary.
See Wall Power Supply Assembly, page 85.
Replace display module. See User
Interface/Control Box, page 30.
Increase pressure to 50 psi (0.35 MPa, 3.5 bar)
or greater.
Check pilot lines for kinks or pinches.
Actuate solenoid manually, if it does not
operate, replace solenoid. Page 30.
Replace valve(s). Page 40.
Service or replace valve(s). Page 40.
See air motor manual.
See Appendix A, in your XM sprayer operation
manual.
Repeat Pump Test with fresh fluid.
If the specific gravity of each fluid is known,
check samples by weight (750cc x specific
gravity equals weight in grams).
If weight is correct, extra volume in beaker is air.
See solutions for previous pump test problem.
Check start switch and wiring harness
continuity; switch is normally open circuit.
See Detailed Electrical Schematic, XM
Sprayer with Wall Power (page 1), starting on
page 51.
Check stop switch and wiring harness
continuity; stop switch is normally closed circuit.
See Detailed Electrical Schematic, XM
Sprayer with Wall Power (page 1), starting on
page 51.
Tighten packing nut. If leak continues, replace
packings.
Troubleshooting
27